<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="now-city">{{this.city}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper"
            v-for="item of hot"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area"
      v-for="(item, key) of cities"
      :key="key"
      :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom"
            v-for="innerItem of item"
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)"
          >
            {{innerItem.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll';
import { mapState, mapMutations } from 'vuex';

export default {
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object,
    letter: String,
  },
  computed: {
    ...mapState(['city']),
  },
  methods: {
    handleCityClick(city) {
      // this.$store.dispatch('changeCity', city); //过程中需要异步调用数据才使用dispatch调用actions
      this.changeCity(city);
      this.$router.push('/');
    },
    ...mapMutations(['changeCity']),
  },
  watch: {
    letter() {
      if (this.letter) {
        const element = this.$refs[this.letter][0];
        this.scroll.scrollToElement(element);
      }
    },
  },
  mounted() {
    // 默认会阻止click事件,需要加上click: true
    this.scroll = new Bscroll(this.$refs.wrapper, { click: true });
  },
};
</script>

<style lang="stylus"  scoped>
  @import '~style/varibles.styl'
  .border-topbottom
    &:before, &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow : hidden
    position: absolute
    top:22vw
    left: 0
    right: 0
    bottom: 0
  .title
    padding: 3vw
    font-size: 4vw
    color: #666
  .button-list
    overflow : hidden
    padding: 2vw
    .button-wrapper
      float: left
      width: 33.33%
      text-align : center
      .button
        margin: 1vw;
        padding: 2vw;
        border: 1px solid #eeeeee;
        font-size: 4vw;
  .item-list
    .item
      line-height : 10vw
      color: #666
      padding-left: 2vw
</style>
